The physical mechanisms of the pyrotechnic cans, which function through the principle of negative pressure adsorption on the human surface, mainly relate to thermal constriction of gases, local pyrovascular expansion, tissue fluid seepage regulation, neuroreflective irritation and the removal of metabolites。
Negative pressure formation:
The combustion in the fire cans produces short periods of high temperatures, and the volume of air in the cans is constricted to negative pressure. The inner pressure of the glass tank can be reduced to 60-80 kpa, equivalent to 0. 6-0. 8 standard atmospheric pressure, which results in the skin tissue of the tank being strongly adsorbed up to an average of 2-3 cm。
2. Carrotary vascular reaction:
Local perforation of the fine vascular wall under negative pressure increased and the diameter expanded to 1. 5-2 times. After five minutes of adsorption, the true cortex microcircle blood flow can increase by 40-60 per cent and this mechanical irritation prompts vascular cells to release hysteresis such as nitrogen oxides。
3. Organization hydrodynamics:
Continued negative pressure reduces inter-organizational water pressure and contributes to the seepage of large molecular substances such as plasma protein. The sorbent area per square centimetre can seep approximately 0. 2 ml tissue fluids per hour, forming the main material base for canned printing, which can sustain 12-24 hours。
Neuroreflective effect:
Mechanical irritation activates abeta neurofibre through skin sensor, and neurodynamic impulses at 35-75 m/s can reach the back corner of the spinal cord. Clinical observations indicate that single-deep cans raise pain thresholds by 15-25 per cent, with effects lasting 4-6 hours, consistent with the mechanisms described in the gate control theory。
3. Metabolism removal:
The winding effect of negative pressure accelerates inter-organizational transfer of metabolic waste, with experimental data showing a 30-45 per cent increase in lactation removal rates and a 20-35 per cent decrease in urea nitrogen concentrations. This physical detoxification is sustainable up to 8-12 hours after the can。
The contact with cold water should be avoided within 24 hours of the emptying of the can, and it is recommended to keep the operational area warm and to use a warm, distilled diet, such as ginger soup. A three-focal exercise with eight pairs of hands can enhance the flow of gas and allow 15-20 minutes of daily exercise. Disabled persons should draw cans at intervals of more than 72 hours and drink yellow tea before and after operation to support the positive gas, but this is prohibited for persons whose skin is broken, heated and condensed。
